1) Having a longitudinal weld steel pipe, inside and outside welds using a submerged arc welded.
2) After expanding the overall mechanical handling, pipe internal stress is small and evenly distributed, which can effectively prevent stress corrosion cracking, high dimensional accuracy, easy on-site welding construction.
3) After the pre-finish welding the welding process, welding process is stable and high weld quality.
4) Weld production process is easy to implement and use of non-destructive testing in the field of non-destructive testing review.
5) Great specifications, can produce small-diameter, thick wall also produces large-diameter, thick-wall steel pipe.
